We consider the problem of representing plans for
mixed-initiative planning, where several participants
cooperate to develop plans. We claim that in such
an environment, a crucial task is plan communication:
the ability to suggest aspects of a plan, accept such
suggestions from other agents, criticize plans, revise
them, etc., in addition to building plans. The complexity
of this interaction imposes significant new requirements
on the representation of plans. We describe
a formal model of plans based on defensible argument
systems that allows us to perform these types
of reasoning. The arguments that are produced are explicit
objects that can be used to provide a semantics
for statements about plans.

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